Composition and process for forming electrically insulating thin films

A process for forming electrically insulating thin films comprising

• (I) coating the surface of a substrate with an insulating thin film-forming composition comprising
• (A) an electrically insulating curable resin selected from electrically insulating curable inorganic resins or electrically insulating curable organic resins,
• (B) solvent, and
• (C) at least one solvent-soluble substance selected from
• (i) substances that upon heating at a temperature of from 0.degree. C. to 800.degree. C. generate a gas;
• (ii) substances that by interaction with resin (A) generate a gas or
• (iii) substances that undergo volatilization at a temperature in the range from 0.degree. C. to 800.degree. C.;
• (II) evaporating the solvent (B);
• and
• (III) subsequently heating the substrate in order to generate gas from component (C) during the course of or after the cure of the said resin (A).

A process for forming electrically insulating thin films comprising

• (I) coating the surface of a substrate with an insulating thin film-forming composition comprising
• (A) an electrically insulating curable inorganic or organic resin,
• (B) a solvent, and
• (C) at least 1 solvent-soluble substance, excluding the solvent used for component (B), that upon heating or by interaction with the resin (A) can generate gas or undergo volatilization in the temperature range from 0.degree. C. to 800.degree. C.;
• (II) evaporating the solvent (B);
• (III) subsequently heating the substrate and effecting a partial cure of the resin (A) at a temperature lower than the temperature that would provide an exhaustive gas generation from component (C);
• and
• (IV) thereafter completing gas generation from component (C).